P212DThrottle Position Sensor/Switch G Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P212D is the high-voltage fault on throttle position signal G. GM documents it in the 2023 and 2024 tables (23OBDG07, 24OBDG07) for sensor 2 of the bank 2 throttle body on a twin-throttle engine: once the raw voltage climbs above 4.805 V for 0.14 s, the code is stored in a single trip. A reading that close to the supply rail usually points to an open sensor ground, an interrupted signal line that the input pulls up, or a short to the 5 V reference or battery voltage. Because both sensors of one throttle often share their ground, P212D can appear alongside a high fault on the first sensor of that throttle. P212C is the low counterpart, P212A the general circuit code. Expect a warning lamp and reduced power.
- What you may notice
- Engine warning lamp on
- Reduced engine power message
- Weak or delayed response to the accelerator
- Likely causes
- LikelyOpen sensor ground at the bank 2 throttle body
- PossibleSignal wire of sensor G shorted to 5 V reference or battery voltage
- PossibleBroken signal wire or pushed-back terminal
- RareInternal fault in the position sensor of the bank 2 throttle
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.